MTBF > 5
Unlimited Cycle Life
Capacitors use Tantalum pentoxide anodes and
Ruthenium Oxide cathodes with wet electrolyte.
This design has been proven in over 15 years
of field service and numerous customer
application qualification tests for use in
Military and Aerospace Systems.
THQ1, THQ2, THQ3,
THQ4, series capacitors all use identical
components. Reported MTBF for THQ3 capacitors
is over 25 Million hours.
THQ5 series are the same as to THQ1, THQ3, and
THQ4 capacitors in every way except for
slightly thinner anode components. All other
components are identical. Years of field
experience with THQ5 capacitors would imply
similar MTBF life.
In THS series capacitors, the in service
field data and qualification test results
reported to us indicate an MTBF of
TDD series capacitors are very similar to
THS capacitors and should provide
equivalent, if not better MTBF.
THQA2(M2) series Capacitors are very similar
to THQ1 capacitors. THQA2(M2) has over ten
years in service and over 30,000 units
fielded; attesting to reliability, and
should provide similar MTBF.
cycle qualification tests and field experience
in Phased Array Radar, LIDAR, and Diode Laser
Drivers, demonstrate that Hybrid capacitors
are not cycle limited in any way. Billions of
shots reported in service with no effect on
TDD cycle testing for Lawrence Livermore NL. 6
billions capacitor cycles over 231 days of
testing, no failures, caps test to spec.
To determine the
above stated MTBF of Hybrid Capacitors, we
rely on actual field data and
qualification test results provided by our
In actual on-wing operational
performance, we have field data from the
Arrowhead system in the Apache Helicopter.
Accumulated hours in service on the Arrowhead
system was provided to us periodically by LMCo
MFC. The last report was accumulated system
hours as of the end of September 2010.
There are multiple quantities of two different
Hybrid Capacitors in that system: THQ3125332 (125V
THQ3050243 (50V 24,000µF) which are packaged as modules.
The accumulated flight hours at that time
represented >10,000,000 capacitor hours of
service, without any failures. Since that time
the program has accumulated many more hours
(probably 100,000 to 200,000 total capacitor
hours per month, as Arrowhead is installed in
a growing percentage of the fleet) without a
single capacitor failure reported.
(125V 4,200µF) has been produced in
significant quantity for a phased array radar
program. Our customer for this system,
Northrop Grumman Baltimore, provided us with
some basic information following their
qualification testing of the capacitors. The
tests were under accelerated
conditions, both pulsing and static, for life
testing of the capacitors. The tests were
ended without a single capacitor failure,
resulting in a greater than 5 million hour
MTBF assessment of capacitor life. Subsequent
fielding of many systems totaling thousands of
capacitors has provided data of excellent
system and capacitor reliability.
Although the actual total in-service hours for
all Hybrid Capacitors is unknown, the total
in-service MTBF can be estimated. To estimate
the total fleet MTBF, we use 260,000 as the number hybrid capacitor units.
This is the number delivered between 2005
and 2012. We use this period as we would
assume that virtually all these units be in
service. At only 100 hours per capacitor this
would provide 26 million capacitor
hours. At 1000 hours per capacitor, this
would provide 260 million capacitor hours. We
would predict that the actual number is
between these points. The incidence of
reported failure is so small, as to be
negligible. Virtually all failure
analysis determined failures were due to
improper mounting, lead attachment, or system
design - usually found in qualification